hw/nvram/mac_nvram.c

   1 /*
   2  * PowerMac NVRAM emulation
   3  *
   4  * Copyright (c) 2005-2007 Fabrice Bellard
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "qemu/osdep.h"
  26 #include "hw/hw.h"
  27 #include "hw/nvram/chrp_nvram.h"
  28 #include "hw/ppc/mac.h"
  29 #include "qemu/cutils.h"
  30 #include <zlib.h>
  31
  32 /* debug NVR */
  33 //#define DEBUG_NVR
  34
  35 #ifdef DEBUG_NVR
  36 #define NVR_DPRINTF(fmt, ...)                                   \
  37     do { printf("NVR: " fmt , ## __VA_ARGS__); } while (0)
  38 #else
  39 #define NVR_DPRINTF(fmt, ...)
  40 #endif
  41
  42 #define DEF_SYSTEM_SIZE 0xc10
  43
  44 /* macio style NVRAM device */
  45 static void macio_nvram_writeb(void *opaque, hwaddr addr,
  46                                uint64_t value, unsigned size)
  47 {
  48     MacIONVRAMState *s = opaque;
  49
  50     addr = (addr >> s->it_shift) & (s->size - 1);
  51     s->data[addr] = value;
  52     NVR_DPRINTF("writeb addr %04" HWADDR_PRIx " val %" PRIx64 "\n",
  53                 addr, value);
  54 }
  55
  56 static uint64_t macio_nvram_readb(void *opaque, hwaddr addr,
  57                                   unsigned size)
  58 {
  59     MacIONVRAMState *s = opaque;
  60     uint32_t value;
  61
  62     addr = (addr >> s->it_shift) & (s->size - 1);
  63     value = s->data[addr];
  64     NVR_DPRINTF("readb addr %04" HWADDR_PRIx " val %" PRIx32 "\n",
  65                 addr, value);
  66
  67     return value;
  68 }
  69
  70 static const MemoryRegionOps macio_nvram_ops = {
  71     .read = macio_nvram_readb,
  72     .write = macio_nvram_writeb,
  73     .valid.min_access_size = 1,
  74     .valid.max_access_size = 4,
  75     .impl.min_access_size = 1,
  76     .impl.max_access_size = 1,
  77     .endianness = DEVICE_BIG_ENDIAN,
  78 };
  79
  80 static const VMStateDescription vmstate_macio_nvram = {
  81     .name = "macio_nvram",
  82     .version_id = 1,
  83     .minimum_version_id = 1,
  84     .fields = (VMStateField[]) {
  85         VMSTATE_VBUFFER_UINT32(data, MacIONVRAMState, 0, NULL, 0, size),
  86         VMSTATE_END_OF_LIST()
  87     }
  88 };
  89
  90
  91 static void macio_nvram_reset(DeviceState *dev)
  92 {
  93 }
  94
  95 static void macio_nvram_realizefn(DeviceState *dev, Error **errp)
  96 {
  97     SysBusDevice *d = SYS_BUS_DEVICE(dev);
  98     MacIONVRAMState *s = MACIO_NVRAM(dev);
  99
 100     s->data = g_malloc0(s->size);
 101
 102     memory_region_init_io(&s->mem, OBJECT(s), &macio_nvram_ops, s,
 103                           "macio-nvram", s->size << s->it_shift);
 104     sysbus_init_mmio(d, &s->mem);
 105 }
 106
 107 static void macio_nvram_unrealizefn(DeviceState *dev, Error **errp)
 108 {
 109     MacIONVRAMState *s = MACIO_NVRAM(dev);
 110
 111     g_free(s->data);
 112 }
 113
 114 static Property macio_nvram_properties[] = {
 115     DEFINE_PROP_UINT32("size", MacIONVRAMState, size, 0),
 116     DEFINE_PROP_UINT32("it_shift", MacIONVRAMState, it_shift, 0),
 117     DEFINE_PROP_END_OF_LIST()
 118 };
 119
 120 static void macio_nvram_class_init(ObjectClass *oc, void *data)
 121 {
 122     DeviceClass *dc = DEVICE_CLASS(oc);
 123
 124     dc->realize = macio_nvram_realizefn;
 125     dc->unrealize = macio_nvram_unrealizefn;
 126     dc->reset = macio_nvram_reset;
 127     dc->vmsd = &vmstate_macio_nvram;
 128     dc->props = macio_nvram_properties;
 129     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 130 }
 131
 132 static const TypeInfo macio_nvram_type_info = {
 133     .name = TYPE_MACIO_NVRAM,
 134     .parent = TYPE_SYS_BUS_DEVICE,
 135     .instance_size = sizeof(MacIONVRAMState),
 136     .class_init = macio_nvram_class_init,
 137 };
 138
 139 static void macio_nvram_register_types(void)
 140 {
 141     type_register_static(&macio_nvram_type_info);
 142 }
 143
 144 /* Set up a system OpenBIOS NVRAM partition */
 145 static void pmac_format_nvram_partition_of(MacIONVRAMState *nvr, int off,
 146                                            int len)
 147 {
 148     int sysp_end;
 149
 150     /* OpenBIOS nvram variables partition */
 151     sysp_end = chrp_nvram_create_system_partition(&nvr->data[off],
 152                                                   DEF_SYSTEM_SIZE) + off;
 153
 154     /* Free space partition */
 155     chrp_nvram_create_free_partition(&nvr->data[sysp_end], len - sysp_end);
 156 }
 157
 158 #define OSX_NVRAM_SIGNATURE     (0x5A)
 159
 160 /* Set up a Mac OS X NVRAM partition */
 161 static void pmac_format_nvram_partition_osx(MacIONVRAMState *nvr, int off,
 162                                             int len)
 163 {
 164     uint32_t start = off;
 165     ChrpNvramPartHdr *part_header;
 166     unsigned char *data = &nvr->data[start];
 167
 168     /* empty partition */
 169     part_header = (ChrpNvramPartHdr *)data;
 170     part_header->signature = OSX_NVRAM_SIGNATURE;
 171     pstrcpy(part_header->name, sizeof(part_header->name), "wwwwwwwwwwww");
 172
 173     chrp_nvram_finish_partition(part_header, len);
 174
 175     /* Generation */
 176     stl_be_p(&data[20], 2);
 177
 178     /* Adler32 checksum */
 179     stl_be_p(&data[16], adler32(0, &data[20], len - 20));
 180 }
 181
 182 /* Set up NVRAM with OF and OSX partitions */
 183 void pmac_format_nvram_partition(MacIONVRAMState *nvr, int len)
 184 {
 185     /*
 186      * Mac OS X expects side "B" of the flash at the second half of NVRAM,
 187      * so we use half of the chip for OF and the other half for a free OSX
 188      * partition.
 189      */
 190     pmac_format_nvram_partition_of(nvr, 0, len / 2);
 191     pmac_format_nvram_partition_osx(nvr, len / 2, len / 2);
 192 }
 193 type_init(macio_nvram_register_types)